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https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c02684463
https://www.redhat.com/archives/redhat-sysadmin-list/2006-October/msg00007.html
https://unix.stackexchange.com/questions/298247/changes-to-etc-security-limits-conf-and-etc-security-limits-d-20-nproc-conf-ha
https://glassonionblog.wordpress.com/2013/01/27/increase-ulimit-and-file-descriptors-limit/
https://easyengine.io/tutorials/linux/increase-open-files-limit
https://askubuntu.com/questions/162229/how-do-i-increase-the-open-files-limit-for-a-non-root-user
https://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/
https://serverfault.com/questions/356962/where-are-the-default-ulimit-values-set-linux-centos
https://superuser.com/questions/740000/modify-and-apply-limits-conf-without-reboot
https://www.tecmint.com/increase-set-open-file-limits-in-linux/
https://www.robustperception.io/dealing-with-too-many-open-files
https://community.pivotal.io/s/article/Session-failures-with-Too-many-open-files
https://www.quora.com/What-is-soft-limit-and-hard-limit-in-Linux